Obsidian is a glassy volcanic rock and a mineral without regular crystalline structure. This means that it is a "free-style" crystal and can be very flexible in how it works with an individual, or through a range of situations. Being so "fresh" from the inner earth all obsidians have a grounding property and most are also protective. It seems that more and more people are choosing to work with obsidian now, as we are being asked to look deeply within ourselves to work out our own balance between who we think we are and who we truly are. It is a great stone for those who have the courage to go within and confront and resolve their relationship with their shadow side. Interestingly we are also finding that young children of 4-8 are being drawn to snowflake obsidian (amazing, as its not a pretty stone with its stark contrasts of black and the white) whilst older people are more drawn to the layered or sheen obsidians.